A5101405532- Surface Modification and Superhydrophobicity
- ZnO doping and properties
- Nanofabrication and Lithography Techniques
- Advanced Materials and Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Adhesion, Friction, and Surface Interactions
- Conducting polymers and applications
- Polymer Surface Interaction Studies
- Ga2O3 and related materials
- Copper-based nanomaterials and applications
- Organic Electronics and Photovoltaics
- Advancements in Photolithography Techniques
- GaN-based semiconductor devices and materials
- Force Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Fluid Dynamics and Thin Films
- Electrowetting and Microfluidic Technologies
- Photonic Crystals and Applications
- Semiconductor materials and devices
- Liquid Crystal Research Advancements
- Gas Sensing Nanomaterials and Sensors
- Thin-Film Transistor Technologies
- Nanomaterials and Printing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Electrospun Nanofibers in Biomedical Applications
Seoul National University
2000-2025
Seoul National University of Science and Technology
2015-2024
Samsung (South Korea)
2024
Seoul Institute
2021
Government of the Republic of Korea
2021
Inje University
2011-2014
Institute for Basic Science
2013
Creative Research
2011
Abstract This Feature Article aims to highlight our recent efforts develop more robust gecko‐inspired dry adhesives and their applications. Due progress in micro‐ nanofabrication techniques, it is possible fabricate highly sophisticated multiscale, hierarchical structures using various polymer materials. In addition, the adhesion strength of synthetic has been shown be similar or exceed that real gecko foot‐hair by several times. Therefore, timely appropriate drive research into a new epoch...
Slanted polymer nanohairs possess a number of attractive properties in terms anisotropic wetting and directional adhesion. This highlight provides an overview the recent progress development bio-inspired slanted their applications towards dry adhesion properties. With advanced nano-fabrication techniques, it is possible to fabricate angled, directionally bent highly reproducible geometry-controllable manner. The fabrication methods can be categorized into two streams: direct replica molding...
Quantum dot/conducting polymer hybrid films are used to prepare light-emitting diodes (LEDs). The (CdSe@ZnS quantum dots excellently dispersed in a conducting matrix, see figure) readily prepared by various solution-based processes and also easily micropatterned. LEDs exhibit turn-on voltage of 4 V, an external efficiency greater than 1.5%, almost pure-green quantum-dot electroluminescence.
Room-temperature imprint lithography showing unique features that are impossible to achieve with conventional high-temperature processes is unveiled here. Large-area nanopatterning, enabled by step-and-repeat and multiple imprinting (see Figure), leads more versatile practical nanoscale patterning.
We present a simple method to fabricate polymer optical sheet with antireflection and antifogging properties. The consists of two consecutive steps: photocross-linking UV-curable polyurethane acrylate (PUA) resin reactive ion etching (RIE). During photopolymerization, the cured PUA film is divided into domains randomly distributed macromers oligomers due relatively short exposure time 20 s at ambient conditions. Using macromer domain as an etch-mask, dry was subsequently carried out remove...
3D TiO2 photoanodes in dye-sensitized solar cells (DSCs) are fabricated by the soft lithographic technique for efficient light trapping. An extended strategy to construction of randomized pyramid structure is developed conventional wet-etching a silicon wafer low-cost fabrication. Moreover, futher enhancement absorption resulting photocurrent increase achieved combining photoanode with scattering layer. As service our authors and readers, this journal provides supporting information supplied...
We present a simple method of utilizing anodized aluminum oxide (AAO) as reproducible template for fabricating high-aspect-ratio uniformly bent polymeric nanopillars that can be used physical adhesive. It is shown how to achieve straight with concepts the work adhesion and lateral collapse between polymer pillars without serious damage master template. With support manufacturing from reusable AAO, route asymmetric dry adhesive by residual stresses was demonstrated.
Fabrication conditions for high-aspect-ratio MNs by the photopolymerization of PEGDA were investigated. The influence prepolymer molecular weight and degree UV absorption photoinitiator (PI) studied to optimize conditions.
SF 6 plasma treatment of indium tin oxide highly improves the power efficiency and stability organic light-emitting diode based on poly[2-methoxy-5-(2-ethylhexyloxy)-1,4phenylenevinylene]. The leads to a slight reduction in surface roughness decrease content Sn. major effect, however, has do with incorporation fluorine. This fluorinated hole injection thus device performance.
Water‐repelling surfaces inspired by lotus leaves have been developed for their commercial needs in superhydrophobic and self‐cleaning coatings on glasses windows. The extraordinary properties originate from multiscale structures with waxy materials. To obtain high transparency as well superhydrophobicity, microhair arrays are designed large spacing to reduce optical scattering effects caused microstructures, but a trilevel hierarchical structure compensate the loss of superhydrophobicity....
We raise issues regarding the 3D printing of complex structures using UV-curable materials. Models failures based on transparency materials, high absorption not reaching upper parts, and mechanical failure are discussed.
Abstract The morphology of conjugated polymers has critical influences on electronic and optical properties optoelectronic devices. Even though lots techniques methods are suggested to control the polymers, very few studies have been performed inducing high charge transport along out‐of‐plane direction. In this study, self‐assembly homo‐ blended which confined in nanostructures is utilized. resulting structures lead mobility vertical direction for both polymers. Both semicrystalline...
Abstract Superomniphobic surfaces inspired by nature have been studied for decades. Recently, the development of liquid‐repelling has moved from fabrication artificial structures to real applications that address friction associated with clothes, paper, and skin. To superoleophobicity, re‐entrant such as mushrooms or inverse trapezoids suggested. However they can be mechanically fragile, especially under shear stress, because bottom region is narrow. Here, a facile method obtain new...
We present a simple approach to reversibly switch the direction of liquid flow on physically symmetric and chemically asymmetric prism structures by exploiting reversibility surface wetting properties thermo-responsive polymer, poly(N-isopropyl-acrylamide). Such an array creates path in lower critical contact angle. This allows unidirectional "step flow" across ridges channels, which can be made reversible with suitable temperature change.
Abstract Microneedle (MN) technology offers a powerful approach for transdermal delivery enabling painless injection and facilitating self‐administration without the need professional assistance. However, weak mechanical strength of MNs can lead to inefficient drug serious skin irritation if fracture during administration leave fragments under skin. Thus, be mechanically robust avoid penetration through while maintaining efficient delivery. Herein, polymer‐based with layer‐by‐layer (LbL)...